JP2001165485A - Fan coil unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fan coil unit excellent in safety in which failure of a fan can be detected automatically. SOLUTION: A heat exchanging coil 2 is provided in a easing 1 and fans 3 are provided in a plurality of stages and rows. Each fan 3 is provided with a DC motor 4 for independent driving. Each DC motor 4 is provided with means for alarming failure of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan coil unit.

[0002]

2. Description of the Related Art A conventional fan coil unit has a small number (for example, two) of blowers.

[0003]

However, when a large number of blowers are provided, for example, even if one blower breaks down, it is inconvenient and inconvenient and lacks safety.

[0004]

Therefore, in order to solve the above-mentioned problems, the present invention provides a heat exchange coil and a large number of blowers in a plurality of stages and a plurality of rows in a casing, and these blowers are separately provided. , And a warning means for reporting a motor failure is provided separately for each of the DC motors. Further, the heat transfer tube of the heat exchange coil was an elliptical tube.

[0005]

1 to 3 show an embodiment of a ceiling-mounted fan coil unit according to the present invention. The fan coil unit includes a heat exchange coil 2 in a hollow casing 1.
And a large number of blowers 3 are provided in a plurality of stages and a plurality of rows, and these blowers 3 are each a fan 5 with a DC motor 4 that is driven separately. The blowers 3 are provided separately and detachably in a plurality of stages and a plurality of rows in the vertical direction so that the work becomes easy when the blower 3 breaks down or the heat exchange coil 2 is maintained.

More specifically, a heat exchange chamber 6 provided with a heat exchange coil 2 and a blower chamber 7 communicating with the heat exchange chamber 6 are formed adjacent to each other in a casing 1. 3 are provided in a plurality of vertical stages and a plurality of horizontal rows so as to be separately detachable. The casing 1 has a suction port 10 communicating with the blower chamber 7 and an air supply port 11 communicating with the heat exchange chamber 6. In the illustrated example, the blowers 3 are arranged more in the left and right rows than in the upper and lower rows, and are arranged in upper and lower rows (two rows) and in the left and right rows (5
And an opening 8 communicating with the heat exchange chamber 6 is formed on the adjacent surface of the heat exchange chamber of the blower chamber 7, and the blower 3 is separately attached to and detached from these openings 8. Attach freely.

When the blower 3 is a push-in type, the air supply port 11
The noise can be reduced. Blower 3 and opening 8
Are arranged in a grid pattern as shown in the figure with respect to the air inlet / outlet surface of the heat exchange coil 2. In addition, the number of the blowers 3 is not limited to the illustrated example, and may be freely increased or decreased. The blowers 3 and the openings 8 may be arranged in a staggered manner with respect to the air inlet / outlet surface of the heat exchange coil 2. By driving the blower 3, air (return air) is sucked from the suction port 10 through the filter 9, and the heat exchange coil 2
And is sent to a plurality of air supply ports 11.
The air supply port 11 is connected to an air outlet (not shown) provided on a ceiling plate or the like via a duct 12 to supply warm air or cold air to the room or the like. Note that solid and dotted outline arrows in all drawings indicate the airflow direction.

[0008] The fan 5 is a small fan, so that the whole fan coil unit is made compact, power and cost are reduced, vibration and noise are reduced, and the casing is simplified and the product cost is reduced. If a fan coil unit that does not require high static pressure for air supply to a room or the like in the immediate vicinity, instead of a small number of conventional large-sized blowers, a large number of units capable of obtaining a corresponding total air volume (for example, By using a small fan 5 with a DC motor 4 that is twice or more and the sum of the number of stages and the number of rows is at least 4 and preferably 5 or more), it is possible to reduce the power consumption and parts cost of the entire blower. Moreover, since the fan 5 is small, the thickness, strength, and weight of the casing 1 do not need to be increased to prevent noise and vibration. Furthermore, even if the blower 3 is of a push type, it is possible to blow air evenly over the entire heat exchange coil 2. As the motor, for example, instead of a large three-phase 200V motor, a large number of small single-phase 100V long-life brushless DC motors having good work efficiency and low power consumption are used.

As shown in FIG. 4, each DC motor 4 has
Alarm means E for reporting a motor failure are separately provided.
The alarm means E includes a detector 15 for detecting motor rotation, a drive circuit 16 for sending a rotation signal to the motor and identifying a motor rotation abnormality based on a signal from the detector 15, and a motor rotation abnormality based on an abnormality signal from the drive circuit 16. Alarm 17 that informs
And For example, if the rotation of a certain DC motor 4 stops due to a failure during the operation of the fan coil, the alarm 17 notifies which DC motor 4 has failed. Thus, it is possible to avoid waste and danger of operating with the performance reduced due to the backflow of air from the stopped blower 3. In this case, the detector 15 only needs to have a function of detecting the presence or absence of rotation of the motor, and the detector 15 and the drive circuit 16 can be simplified. Further, when the detector 15 has a function of detecting the motor rotation speed, the detector 15 can be used for both the determination of the abnormality of the motor rotation and the feedback of the motor rotation speed, and high-precision control can be performed. For example, even if the rotation of the motor does not stop, a rotation speed command value from the drive circuit 16 and a rotation speed detection value from the detector 15 are compared, and an abnormal DC motor 4 that rotates excessively or excessively low can be reported. You can also.

The driving circuit 16 is constituted by a microcomputer or the like,
The rotation speed is commanded to the motor 4 by a signal from the controller 18 to adjust the air volume steplessly or stepwise. If the drive circuit 16 is capable of changing the rotation speed in a stepless manner, the air volume can be adjusted by the blower itself, and fine air conditioning can be performed. The micro-wind operation can be easily performed, and there is no pressure loss because no damper is used. The alarm means E only needs to have a function of reporting a failure such as an abnormal rotation or abnormal stop of the individual DC motors 4, and the alarm means E is not limited to the above-described configuration and can be freely changed.

Although the fan coil unit shown in FIGS. 1 to 3 is of a ceiling-mounted type, it may be of a floor-mounted type as shown in FIGS. 5 and 6. In this case, the blowers 3 are arranged more vertically than in the left and right rows. is there.

In each of the above embodiments, the blower 3 is of a push type, but may be of a suction type. Further, in each of the above-described embodiments, a large number of blowers 3 may be separately detachably provided in a plurality of stages and a plurality of rows in the horizontal direction. For example, the fan coil units of the above embodiments are rotated 90 degrees around the horizontal axis so that the blowers 3 are arranged in multiple stages and multiple rows in front, rear, left and right.

In each of the above embodiments, as shown in FIG. 7, the heat transfer tube 14 of the heat exchange coil 2 is formed as an elliptic tube having a radially cut surface in an elliptical shape. It is most preferable that the major axis direction of the elliptical shape be substantially parallel to the blowing direction A in order to reduce the air resistance. Since the cross section of the heat transfer tube 14 is formed in an elliptical shape having a small shape drag, the ventilation resistance is smaller and the pressure loss is reduced as compared with the case of the circular heat transfer tube, and the contact area of the heat transfer tube 14 with the air flow ( (Heat transfer area) increases, and the amount of heat transfer and heat exchange increases. Moreover, a fan 5 with a smaller DC motor 4
And reduce the number. Note that the heat transfer tube 14 may be a circular tube.

[0014]

According to the first aspect of the present invention, it is possible to identify which blower 3 is out of order without performing periodic inspections, which is convenient, maintenance is easy, and safety is excellent. According to the second aspect of the present invention, the pressure loss is reduced, and a small-sized blower can be used.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is an explanatory diagram of a blower.

FIG. 5 is a side view showing another embodiment of the present invention.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

FIG. 7 is a sectional view of a main part of the heat exchange coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Heat exchange coil 3 Blower 4 Motor 5 Fan 14 Heat transfer tube E Alarm means

Claims (2)

[Claims] 1. A heat exchange coil 2 is provided in a casing 1 and a large number of blowers 3 are provided in a plurality of stages and in a plurality of rows. These blowers 3 are each a fan 5 with a DC motor 4 which is separately driven. A fan coil unit, wherein a warning means E for reporting a motor failure is separately provided to the DC motor 4. 2. The fan coil unit according to claim 1, wherein the heat transfer tube 14 of the heat exchange coil 2 is an elliptical tube.